arch/powerpc/include/asm/vdso_datapage.h

   1 #ifndef _VDSO_DATAPAGE_H
   2 #define _VDSO_DATAPAGE_H
   3 #ifdef __KERNEL__
   4
   5 /*
   6  * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
   7  * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
   8  *                    IBM Corp.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version
  13  * 2 of the License, or (at your option) any later version.
  14  */
  15
  16
  17 /*
  18  * Note about this structure:
  19  *
  20  * This structure was historically called systemcfg and exposed to
  21  * userland via /proc/ppc64/systemcfg. Unfortunately, this became an
  22  * ABI issue as some proprietary software started relying on being able
  23  * to mmap() it, thus we have to keep the base layout at least for a
  24  * few kernel versions.
  25  *
  26  * However, since ppc32 doesn't suffer from this backward handicap,
  27  * a simpler version of the data structure is used there with only the
  28  * fields actually used by the vDSO.
  29  *
  30  */
  31
  32 /*
  33  * If the major version changes we are incompatible.
  34  * Minor version changes are a hint.
  35  */
  36 #define SYSTEMCFG_MAJOR 1
  37 #define SYSTEMCFG_MINOR 1
  38
  39 #ifndef __ASSEMBLY__
  40
  41 #include <linux/unistd.h>
  42 #include <linux/time.h>
  43
  44 #define SYSCALL_MAP_SIZE      ((NR_syscalls + 31) / 32)
  45
  46 /*
  47  * So here is the ppc64 backward compatible version
  48  */
  49
  50 #ifdef CONFIG_PPC64
  51
  52 struct vdso_data {
  53         __u8  eye_catcher[16];          /* Eyecatcher: SYSTEMCFG:PPC64  0x00 */
  54         struct {                        /* Systemcfg version numbers         */
  55                 __u32 major;            /* Major number                 0x10 */
  56                 __u32 minor;            /* Minor number                 0x14 */
  57         } version;
  58
  59         /* Note about the platform flags: it now only contains the lpar
  60          * bit. The actual platform number is dead and buried
  61          */
  62         __u32 platform;                 /* Platform flags               0x18 */
  63         __u32 processor;                /* Processor type               0x1C */
  64         __u64 processorCount;           /* # of physical processors     0x20 */
  65         __u64 physicalMemorySize;       /* Size of real memory(B)       0x28 */
  66         __u64 tb_orig_stamp;            /* Timebase at boot             0x30 */
  67         __u64 tb_ticks_per_sec;         /* Timebase tics / sec          0x38 */
  68         __u64 tb_to_xs;                 /* Inverse of TB to 2^20        0x40 */
  69         __u64 stamp_xsec;               /*                              0x48 */
  70         __u64 tb_update_count;          /* Timebase atomicity ctr       0x50 */
  71         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x58 */
  72         __u32 tz_dsttime;               /* Type of dst correction       0x5C */
  73         __u32 dcache_size;              /* L1 d-cache size              0x60 */
  74         __u32 dcache_line_size;         /* L1 d-cache line size         0x64 */
  75         __u32 icache_size;              /* L1 i-cache size              0x68 */
  76         __u32 icache_line_size;         /* L1 i-cache line size         0x6C */
  77
  78         /* those additional ones don't have to be located anywhere
  79          * special as they were not part of the original systemcfg
  80          */
  81         __u32 dcache_block_size;                /* L1 d-cache block size     */
  82         __u32 icache_block_size;                /* L1 i-cache block size     */
  83         __u32 dcache_log_block_size;            /* L1 d-cache log block size */
  84         __u32 icache_log_block_size;            /* L1 i-cache log block size */
  85         __s32 wtom_clock_sec;                   /* Wall to monotonic clock */
  86         __s32 wtom_clock_nsec;
  87         struct timespec stamp_xtime;    /* xtime as at tb_orig_stamp */
  88         __u32 stamp_sec_fraction;       /* fractional seconds of stamp_xtime */
  89         __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
  90         __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
  91 };
  92
  93 #else /* CONFIG_PPC64 */
  94
  95 /*
  96  * And here is the simpler 32 bits version
  97  */
  98 struct vdso_data {
  99         __u64 tb_orig_stamp;            /* Timebase at boot             0x30 */
 100         __u64 tb_ticks_per_sec;         /* Timebase tics / sec          0x38 */
 101         __u64 tb_to_xs;                 /* Inverse of TB to 2^20        0x40 */
 102         __u64 stamp_xsec;               /*                              0x48 */
 103         __u32 tb_update_count;          /* Timebase atomicity ctr       0x50 */
 104         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x58 */
 105         __u32 tz_dsttime;               /* Type of dst correction       0x5C */
 106         __s32 wtom_clock_sec;                   /* Wall to monotonic clock */
 107         __s32 wtom_clock_nsec;
 108         struct timespec stamp_xtime;    /* xtime as at tb_orig_stamp */
 109         __u32 stamp_sec_fraction;       /* fractional seconds of stamp_xtime */
 110         __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
 111         __u32 dcache_block_size;        /* L1 d-cache block size     */
 112         __u32 icache_block_size;        /* L1 i-cache block size     */
 113         __u32 dcache_log_block_size;    /* L1 d-cache log block size */
 114         __u32 icache_log_block_size;    /* L1 i-cache log block size */
 115 };
 116
 117 #endif /* CONFIG_PPC64 */
 118
 119 extern struct vdso_data *vdso_data;
 120
 121 #endif /* __ASSEMBLY__ */
 122
 123 #endif /* __KERNEL__ */
 124 #endif /* _SYSTEMCFG_H */